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On my DHCP client list I see unknown record. There is host with MAC starting with 10:AE:60... (I couldn't find any manufacturer using that type of MAC) and with assigned IP 192.168.1.78. This host doesn't have host name.

What's strange I don't see this host on Traffic control tab. This IP is not pingable. I tried to scan it with nmap but without success.

Could be anything. TV set top box, game console ??Often mobile telephones a Host name is not set.Could be a "stranger" to, "hitch-hiking" anonymously on your internet connection as he/she have your WiFi password.